Fix a build break due to the missing kKeyRotation

Change-Id: I6bf030c946abe7a95f8f7bc464e6507fb02cf39c
diff --git a/include/media/stagefright/MetaData.h b/include/media/stagefright/MetaData.h
index a72aabf..b4c5d3c 100644
--- a/include/media/stagefright/MetaData.h
+++ b/include/media/stagefright/MetaData.h
@@ -32,6 +32,7 @@
     kKeyMIMEType          = 'mime',  // cstring
     kKeyWidth             = 'widt',  // int32_t
     kKeyHeight            = 'heig',  // int32_t
+    kKeyRotation          = 'rotA',  // int32_t (angle in degrees)
     kKeyIFramesInterval   = 'ifiv',  // int32_t
     kKeyStride            = 'strd',  // int32_t
     kKeySliceHeight       = 'slht',  // int32_t